Infrapatellar contracture syndrome, or patella infera, is a more advanced form of arthrofibrosis that can occur either in an isolated form - meaning that it affects just the patellofemoral joint – or in a more extensive form in that it also involves the entire knee joint, where it affects flexion and extension of the knee as well.

For the purposes of the discussion I will just limit the discussion to the type of scarring that affects the patellofemoral joint. Where this scarring usually occurs most commonly is in the medial and lateral gutters and directly behind the patellar tendon, scarring the patellar tendon down to the front of the tibia.
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The anterior interval of the knee is the area between the anterior portion of the tibia (or the front portion of the tibia) and the fat pad which lies in this area and just behind or posterior to the patellar tendon. This area is sometimes called the 'pre-tibial recess' or the 'anterior interval of the knee'.
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Arthrofibrosis is a problem in which abnormal scar tissue forms within the knee. It usually occurs in post-traumatic and post-surgical settings and can manifest itself in many different ways. The severity can range from small amounts of scar tissue in certain locations within the knee that may only cause symptoms with certain activities to diffuse scarring that is chronically painful and completely restricts all motion of the knee.
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